Global warming, which means climate change, is a big danger for all living beings. First, this phenomenon basically causes carbon dioxide, so when there is more carbon dioxide in the atmosphere than normal, global warming happens. Second, the increase in global warming leads to a decrease in the diversity of species and disrupts ecosystems. As an illustration, we will have only a few forests in the future because people are annihilating forests. Also, plants and animals are in danger. Therefore, we may not see some species in the future. In conclusion, global warming is a big problem for the world. What we should do is clear: recycling, renewable energy and using public transportation.